Motorcycle crank case



FIG. 1 is a top perspective view of a motorcycle crank case showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a left side elevational view thereof.

The broken lines shown in all views of the drawing are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a motorcycle crank case, as shown. 